The snippets suggest you were storing a reference to an object on the
stack. Stack variables go out of scope when the function returns. Using a
reference to them out-of-scope is illegal but often fails
nondeterministically. Good compilers will issue a warning about this under
the right conditions (
Hi all,
Sorry no reply.
I just figured out the solution.
The problem was that I had a function that would MPI_Isend a message on
every call to it. Then I'd store its request pointer to a list.
My MPI_Isend snippet:
MPI_Request req;
MPI_Isend(blabla, &req)
task_push(&req);
>From time to time at
On Jul 27, 2019, at 10:43 PM, Gilles Gouaillardet via users
wrote:
>
> MPI_Isend() does not automatically frees the buffer after it sends the
> message.
> (it simply cannot do it since the buffer might be pointing to a global
> variable or to the stack).
Gilles is correct: MPI_Isend does not f
Carlos,
MPI_Isend() does not automatically frees the buffer after it sends the message.
(it simply cannot do it since the buffer might be pointing to a global
variable or to the stack).
Can you please extract a reproducer from your program ?
Out of curiosity, what if you insert an (useless) MPI_
Hi Jeff,
Thank you for your reply.
If i don't free the program completes but I'm not sure whether MPI_Isend
automatically frees the buffer after it sends the message. Does it?
I put a long sleep at the end to check the memory used using pmap.
The pmap command reported I'm using around 2GB which
> On Jul 21, 2019, at 11:31 AM, carlos aguni via users
> wrote:
>
> MPI_Isend()
> ... some stuff..
> flag = 0;
> MPI_Test(req, &flag, &status);
> if (flag){
> free(buffer);
> }
>
> After the free() i'm getting errors like:
> [[58327,1],0][btl_tcp_frag.c:130:mca_btl_tcp_frag_send]
> mca_btl
Hi all,
I've got a code where I MPI_Isend at a time and later I get the result from
MPI_Test flag to see whether it has completed or not.
So the code is like:
MPI_Isend()
... some stuff..
flag = 0;
MPI_Test(req, &flag, &status);
if (flag){
free(buffer);
}
After the free() i'm getting errors
